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參數(shù)資料
| 型號： | UCE-1.2/25-D48PL1-C |
| 廠商： | MURATA POWER SOLUTIONS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-8 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 291K |
| 代理商： | UCE-1.2/25-D48PL1-C |
UCE Series
Isolated, High-Density, Eighth-Brick
Low Prole DC/DC Converters
www.murata-ps.com
email: sales@murata-ps.com
Figure 9. On/Off Enable Control Ground Bounce Protection
Preferred location
of On/Off control
adjacent to -Vin
terminal
DC/DC Converter
Install separate
return wire for
On/Off control
with remote
transistor
On/Off
Control
Transistor
Do not connect
control transistor
through remote
power bus
Ground plane or power return bus
+ Vin
On/Off Enable
-Vin return
04 May 2010
MDC_UCE.A27 Page 12 of 16
Remote On/Off Control
On the input side, a remote On/Off Control can be specied with either positive
or negative logic polarity.
Positive: Models equipped with positive logic are enabled when the On/Off
pin is left open or is pulled high to +Vin with respect to –Vin. An internal bias
current causes the open pin to rise to approximately +15V. Some models will
also turn on at lower intermediate voltages (see Specications). Positive-polarity
devices are disabled when the On/Off is grounded or brought to within a low
voltage (see Specications) with respect to –Vin.
Negative: Models with negative polarity are on (enabled) when the On/Off is
grounded or brought to within a low voltage (see Specications) with respect to
–Vin. The device is off (disabled) when the On/Off is left open or is pulled high
to approximately +15V with respect to –Vin.
Dynamic control of the On/Off function should be able to sink the speci-
ed signal current when brought low and withstand appropriate voltage
when brought high. Be aware too that there is a nite time in milliseconds
(see Specications) between the time of On/Off Control activation and stable,
regulated output. This time will vary slightly with output load type and current
and input conditions.
On/Off Enable Control Ground Bounce Protection
To improve reliability, if you use a small signal transistor or other external
circuit to select the Remote On/Off control, make sure to return the LO side
directly to the –Vin power input on the DC/DC converter. To avoid ground
bounce errors, do not connect the On/Off return to a distant ground plane or
current-carrying bus. If necessary, run a separate small return wire directly to
the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off
control however, large current changes on a return ground plane or ground bus
can accidentally trigger the converter on or off. If possible, mount the On/Off
transistor or other control circuit adjacent to the converter.
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if
you carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor, a switch or a relay (which can thereupon be
controlled by logic) returned to negative Vin.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specications. Users should only consider adding capacitance to reduce switch-
ing noise and/or to handle spike current step loads. Install only enough capaci-
tance to achieve noise objectives. Excess external capacitance may cause
regulation problems, slower transient response and possible instability. Proper
wiring of the Sense inputs will improve these factors under capacitive load.
The maximum rated output capacitance and ESR specication is given for a
capacitor installed immediately adjacent to the converter. Any extended output
wiring or smaller wire gauge or less ground plane may tolerate somewhat higher
capacitance. Also, capacitors with higher ESR may use a larger capacitance.
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